Shelf



FIG. 1 is a perspective view of a shelf showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is an end view thereof, the opposite end being a mirror image of the end shown;

FIG. 4 is a top view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear view thereof.

The broken line showing in FIG. 7 is included for the purpose of illustrating portions of the shelf and forms no part of the claimed design. 

CLAIM The ornamental design for a shelf, as shown and described. 